Deletes the specified message from the specified queue. You specify
the message by using the message's receipt handle and not
the message ID you received when you sent the message.
Even if the message is locked by another reader due to the visibility
timeout setting, it is still deleted from the queue. If you leave a
message in the queue for longer than the queue's configured retention
period, Amazon SQS automatically deletes it.

NOTE: The receipt handle is associated with a specific instance
of receiving the message. If you receive a message more than once, the
receipt handle you get each time you receive the message is different.
When you request DeleteMessage, if you don't provide the most recently
received receipt handle for the message, the request will still
succeed, but the message might not be deleted.

IMPORTANT: It is possible you will receive a message even after
you have deleted it. This might happen on rare occasions if one of the
servers storing a copy of the message is unavailable when you request
to delete the message. The copy remains on the server and might be
returned to you again on a subsequent receive request. You should
create your system to be idempotent so that receiving a particular
message more than once is not a problem.